Checking earth connections is a generally good thing, and Caterham suggests that bad earths cause ? 80% of smoke problems. But... Problems with the warning light seem surprisingly common, and most of those discussed here don't seem to have simple solutions at the end of the story. I think that's because victims either replace everything in sight or end up living with the problem. I'd approach it by investigating three specific types of cause: Problems in the warning light circuit: LEDs (as above), wiring, wrong terminal on the alternator. (And it is a strange circuit... who thought this up?) The alternator isn't charging properly. The voltage on the warning light terminal of the alternator isn't being asserted properly.Those are each quite easy to test. How about buying a multimeter (+ extra leads with croc clips) before Andrew's visit and asking him to show you how with the one you're going to end up with? Jonathan